I'm really lamenting the fact that none of the pre-amps that I can find have 300 ohm inputs. I found the circuit layout for one in a 1977 IEEE Transactions on Broadcasting
(Advanced Antenna Design and an Ultralow-Noise Preamplifier Extend UHF Viewing Area : ieeexplore.ieee.org/iel5/11/4044035/04044041.pdf but you need an IEEE account or access to an institution that has one... Thanks, local college!)
But that is beyond my current insanity level here.